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Message-ID: <b9e2a3c1-cb18-0016-677f-ae39d24996e3@broadcom.com>
Date:   Wed, 6 Apr 2022 14:07:45 +0200
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Subject: Re: Support for bcm43364 wireless chipset in brcm80211/brcmfmac
From:   Arend van Spriel <arend.vanspriel@broadcom.com>
To:     Jupiter <jupiter.hce@gmail.com>
Cc:     "David S. Miller" <davem@davemloft.net>,
        Sean Lanigan <sean@lano.id.au>,
        linux-wireless <linux-wireless@vger.kernel.org>,
        Double.Lo@infineon.com, Kalle Valo <kvalo@kernel.org>
References: <CAA=hcWQFNOeycXFPhrtHcQG3V8fWSShNRuAi49jtv8h1fPVUuQ@mail.gmail.com>
 <8ef5d73a-6293-a6c5-6bbb-b130266a8f0b@broadcom.com>
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In-Reply-To: <3ce6bc12-736f-cde5-ebd4-0224c5733a9e@broadcom.com>
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+ the other Kalle ;-)

On 4/6/2022 1:56 PM, Arend van Spriel wrote:
> + Double Lo
> 
> On 4/6/2022 9:36 AM, Jupiter wrote:
>> Hi Arend,
>>
>> Thanks for your response.
>>
>>>> Our design criteria is that it must be supported by mainline Linux.
>>>> Searching kernel log file to find that you added bcm43364 wireless
>>>> chipset to broadcom/brcm80211/brcmfmac driver, could you please advise
>>>> how stable and reliable to run brcm80211/brcmfmac for CYW43364 /
>>>> Broadcom BCM43364 Chipset?
>>>
>>> Is Murata providing you with firmware or just the hardware.
>>
>> Good question, we'll buy Murata hardware and we'll use Murata firmware
>> in linux-firmware so we can run Yocto to build WiFi to the image using
>> mainline Linux, linux-firmware and other open sources.
>>
>> I've just checked the firmware, there is no bcm43364 binary in
>> linux-firmware, only bcm43362 links to cyfmac43362-sdio.bin, is the
>> cyfmac43362-sdio.bin the right firmware for Murata WiFi module
>> LBWA1KL1FX (CYW43364 / BCM43364 Chipset)? If not, where is the right
>> Murata WiFi module LBWA1KL1FX firmware in linux-firmware?
> 
> Indeed. As Sean stated in his commit message "The BCM43364 uses the same 
> firmware as the BCM43430 (which is already included), the only 
> difference is the omission of Bluetooth".
> 
> So for BCM43364 the brcmfmac driver will load brcmfmac43430-sdio.bin. 
> Now it can be that the Murata WiFi module would need dedicated firmware 
> that Murata provides. If your project/design is device-tree based 
> (likely if it is a IMX6 ARM-based SoC) your device-tree will have a 
> boardname and brcmfmac would try to find 
> brcmfmac43430-sdio-<boardname>.bin or something like that. If not 
> present it will fallback to the generic firmware mentioned earlier.
> 
>> The Broadcom did very good job to support mainline Linux, Cypress
>> acquired Broadcom wireless IoT, Infineon acquired Cypress wireless,
>> has anyone known if the Infineon is committed to continually maintain
>> and support CYW43364 / BCM43364 Chipset driver and firmware in
>> mainline Linux and linux-firmware?
> 
> Infineon is listed in the MAINTAINERS file so I suppose they are. Hmm, 
> there was a patch stripping Infineon names from it. I added the author 
> of that patch to comment.
> 
>> There is a wired backward tendency in recent years, large vendors
>> acquired wireless sectors then stopped supporting open source and
>> mainline Linux, switched its wireless sources to use its proprietary
>> Linux and SDK. Our original design was using Marvell Avastar 88W8801
>> chipset, the driver mwifiex and wifiex_sdio worked well for kernel 4,
>> but after NXP acquired Marvell wireless sector, NXP stopped supporting
>> mainline Linux, the kernel 5 mwifiex cannot communicate to 88W8801
>> chipset firmware, we were told to use the proprietary Linux driver
>> sources which is incompatible to our Yocto / OE build system, we have
>> no choice but to change the WiFi module.
>>
>>>> In addition to add CONFIG_BRCMFMAC and CONFIG_BRCMFMAC_SDIO, should I
>>>> also add   CONFIG_BRCMFMAC_PROTO_MSGBUF, CONFIG_DMI,
>>>> CONFIG_BRCMFMAC_PROTO_BCDC and CONFIG_OF?
>>>
>>> I would suggest using menuconfig as it already answers some if not all
>>> of these. CONFIG_DMI and CONFIG_OF are really depending on your 
>>> platform.
>>
>> We'll certainly use the menuconfig that is not the issue, our CPU is
>> iMX6ULZ running on kernel 5.10, apologize we are not familiar with the
>> CONFIG_DMI and CONFIG_OF, appreciate your advice.
> 
> If your using IMX6 you will likely use device-tree as I mentioned 
> before. So you probably will have CONFIG_OF enabled. OF stands for 
> OpenFirmware and the kernel functionality is also used handling 
> flattened device-trees.
> 
> Regards,
> Arend

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